How I missed the frame component in modern day applications. They all seem to think that a bold heading and some extra whitespace at the end is sufficient to group things together.
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A related missing-but-important one is a proper TabView. I don't know who first passed off a row of plain buttons as a TabView (probably Apple), but it's trash because (like the lack of GroupBox) it does not demarcate what controls below it are ON the selected tab's view! I mean... duh.